Feanz eabl



2 Sheets-Sheet 2.

P. RABL.

ELBGTRIG AROLAMP.

(No ModeL) No. 280,763. 'Patented July 3, 1883.

INVENTOR! WITNESSES UNITED STATES PATENT OFEICEL;

FRANZ RABL, or CAMDEN, NEw JERSEY, ASSIGNOR To THE ATL NTIC AND PACIFICELECTRIC MANUFACTURING COMPANY, OF sAME PLACE.

ELECTRlC-ARC LAMP.

SPECIFICATION forming part of Letters Patent 110,280,763, dated July 3,1883.

7 Application filed January 12, 1883. (N0 model.) 7 I To all whom it mayconcern Be it known that I, FRANZ RABL, a subject of the Emperor ofAustria, and a resident of Camden, Camden county, New Jersey, haveinvented certain Improvements in Electric Arc Lamps, of which thefollowing is a specification.

My invention consists of certain improvements in the devices for feedingand regulating the movable carbons of electric-arc lamps, as more fullydescribed hereinafter.

In the accompanying drawings, Figure 1 is a vertical section ofsufficient of an electric lamp to illustrate my improvements; Fig. 2, asectional plan on the line 1 2, Fig. 1; Fig. 3, a sectional plan on theline 3 4, and Fig. 4 a view of a portion of the lamp.

My invention consists more particularly of an improved combination ofdevices for im parting a positive feed to the carbon-holder, and thesedevices may be combined with areforming mechanism of any suitableconstruction; but in the accompanying drawings I have shown anarrangement of arc-forming devices 011 the principle shown in theLetters Patent granted to H. OSample and myself October 11, 1881, No.248,111.

A and A are the rods or side bars of the lower portion of the frame ofthe lamp, in which is mounted the fixed or negative carbon N. To theupper ends of these bars are secured the plate B and its arched frame B,on which the regulating devices are mounted, the said plateB and itsparts being insulated from the lower portion of the frame. The side barA carries at its upper end an insulated binding-post, a, while the bar Ahas a similar post, a, in metallic Contact therewith.

Through the center of the arched frame B and of the plate B passes themovable rod 0, Carrying the positive carbon P, and to the upper end ofthis rod 0 is secured a piston, D, adapted to the interior of a tube, E,carried by the frame B.

To the under side of the arched frame B is centrally secured anelectro-magnet, M, wound with coarse wire in the main circuit, and tothe upper side of theplate B is secured another electro-magnet, M, woundwith fine wire for the shunt-circuit. These two electro-magnets are inline with each other, and have hol- .low cores, through which thecarbon-holder G can pass freely. Between the adj oining-polcs of thesetwo electro-magnets are arranged two armatures, F and F, whose pivotsare adapted. 5 5

to horizontal'slots in lugs f f, carried by either of theelectro-magnets. The inner ends of these armatures are beveled, Fig. 1,and rounded, Fig. 2, to partially fit around the carbon-rod O. by meansof spiralsprings f f. Non-magnetic plugs m m and m m prevent the ends ofthe armatures from coming into Contact with and sticking to the pole ofeither magnet.

The carbon-holder C is in the form of a tube, on the inner face of whichis cut a series of ratchet-teeth or screw-threads, as shown in Fig. 1.,the upper end of the tube being open. Within this tube is a rod, J,having springfingers at its lower end, adapted to engage with theratchetteeth in the tube, the rod being seited longitudinal movement ofthe core H with- 7 5 in thecoil G. The main circuit, entering, at thebinding-post a, passes through the conductor 1, coil of electro-magnetM, and conductor 2, to the carbon-holder O, thence to positive carbon P,negative N, lower-carbon holder, side bar A, and out at binding-post a.A shunt-circuit passes from the post a, through conductor 3, coil ofelectro-magnct M, and conductor 4, to the binding-post a. One terminalof the coil G, which may have a resistance equal to .or slightly greaterthan that of the coil of the clectro-magnet M, is connected to the tubeE, or some portion of the frame in the main circuit, while the otherterminal is connected by the conductor 5 to the bindingpost a. When thelamp is first put in circuit, the current, passing through the coilofthe electro-magnet M, causes the latter to attract and raise the innerends of the armatures F F, which, acting as pawls onthe rod 0, raise thelatter and form the are. As

the carbons are consumed, the increase of current in the shunt-circuitswill first cause the attraction of the electro-magnet M for thearmatures to overcome the attraction of the electro-magnet M, and socause the inner ends of the pawls F F to drop, and the increase ofcurrent in the shunt-coil G will then cause the descent of the core H,and the consequent pushing downward of the holder 0 by the prongs of therod J. On the immediate decrease of current in this shuntcircuit, thespring It will return the core H and with it the forked rod J to theirnormal positions shown in Fig. 1. In order to release the fingers orprongs of the rod J from the ratchet-teeth, to raise the holder 0 by thehand to insert a new carbon, I arrange over this rod a tube, K, havingits lower end immediately over the prongs, and its upper end providedwith ahandle, k, adapted to a bayonet joint in the tube E, so that by Uturning this handle in the bayonetjoint the tube K may be pushed downoverthe prongs of the rod J to release them from the teeth on theinterior of the tube 0.

I claim as my invention- 1. The combination, in an electric lamp, of amovable carbon-holder provided with ratchetteeth, and devices,substantially as described, for separating the carbons to form the arc,with H, carrying a rod, J, within the tube, and having prongs adapted toengage with said ratchet-teeth, all substantially as set forth.

3. The combination of the carbon-holdii'lg tube having ratchet-teeth onits inner face, 35 with a push-rod, J, within the same, having springfingers or prongs adapted to engage with said teeth, and areleasing-tube, K, sub stantially as described.

In testimony whereof I have signed my name; 40

to this specification in the presence of two sub scribing witnesses.

v FRANZ RABL. Witnesses:

THOMAS DUGAN, HUBERT HowsoN.

